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var(--verm);background-color:var(--verm-wash);color:var(--tab-fg)}.thumbs__no{position:absolute;left:5px;top:4px;font:500 var(--fs-mono)/1 var(--f-mono);letter-spacing:0;opacity:1;font-variant-numeric:tabular-nums;color:color-mix(in srgb,var(--ink-3) calc(max(var(--q),.5)*100%),var(--ink))}.thumbs__short{display:block;max-width:100%;font:500 13px/1.1 var(--f-text);letter-spacing:0;text-transform:none;text-align:center;white-space:nowrap}.thumbs__short:lang(zh){font:500 13px/1.1 var(--f-cjk-ui);letter-spacing:.02em}.thumbs__glyph{font-family:var(--f-cjk-display);font-weight:900;font-size:18px;line-height:1}.thumbs__label{position:absolute;right:calc(100% + 10px);top:50%;display:flex;align-items:baseline;gap:8px;padding:8px 12px;background:var(--ink);color:var(--paper);font:500 14px/1.2 var(--f-text);letter-spacing:0;white-space:nowrap;opacity:0;pointer-events:none;transform:translate(10px,-50%);transition:opacity var(--t-ui) var(--ease-ui),transform var(--t-ui) var(--ease-ui)}.thumbs__label:after{content:"";position:absolute;right:-5px;top:50%;width:0;height:0;border-left:5px solid var(--ink);border-top:5px solid transparent;border-bottom:5px solid transparent;transform:translateY(-50%)}.thumbs__tab:hover .thumbs__label,.thumbs__tab:focus-visible .thumbs__label{opacity:1;transform:translateY(-50%)}.thumbs__tab:focus-visible{outline:2px dashed currentColor;outline-offset:-5px}.thumbs__tab[aria-current=page],.thumbs__tab[aria-current=true],.thumbs__tab.is-active{background:var(--verm);color:var(--on-verm)}.thumbs__tab:is([aria-current=page],[aria-current=true],.is-active) .thumbs__no{color:inherit}.thumbs__tab[aria-current=page]:before,.thumbs__tab[aria-current=true]:before,.thumbs__tab.is-active:before{content:"";position:absolute;left:-7px;top:0;bottom:0;width:7px;background:var(--verm)}.thumbs__tab.is-stamped:after{content:"";position:absolute;right:calc(var(--tab-bleed-w) + 4px);bottom:4px;width:5px;height:5px;border-radius:50%;background:var(--gold);box-shadow:0 0 6px #f2b45acc}.thumbs__tab--console{display:none}.thumbs__tab--boundary,.thumbs__tab--index{flex-grow:.85}.thumbs__tab--console .icon,.thumbs__tab--console .ico{width:20px;height:20px}@media(min-width:901px)and (min-height:501px),(min-width:901px)and (orientation:portrait){.thumbs{--tab-pad: 6px}.thumbs__tab{flex-direction:column;align-items:flex-start;justify-content:center;gap:3px;padding:6px calc(var(--tab-bleed-w) + 1px) 6px var(--tab-pad);background-image:linear-gradient(to left,var(--tab-bleed) var(--tab-bleed-w),transparent var(--tab-bleed-w))}.thumbs__no{position:static}.thumbs__short{text-align:left}}@media(min-width:1280px),(hover:none)and (min-width:901px){:root{--rail-w: 80px}.thumbs__tab{flex-direction:column;gap:3px}.thumbs__glyph{font-size:22px}}@media(min-width:901px)and (max-width:1279px)and (hover:hover){.thumbs__short{display:none}}@media(min-width:901px)and (max-height:800px){.thumbs__tab{padding-top:4px;padding-bottom:4px;gap:2px}.thumbs__no{display:none}}@media(min-width:901px)and (max-height:620px){.thumbs__short{display:none}}@media(max-width:900px),(max-height:500px)and (orientation:landscape){.thumbs{inset:auto 0 0;width:auto;height:calc(var(--strip-h) + var(--safe-b));padding:0 var(--safe-r) var(--safe-b) 0;flex-direction:row;overflow-x:auto;overflow-y:hidden;scroll-snap-type:x mandatory;scroll-padding-left:calc(64px + var(--safe-l));overscroll-behavior-x:contain;scrollbar-width:none;border-left:0;border-top:1px solid var(--tab-edge);-webkit-overflow-scrolling:touch}.thumbs::-webkit-scrollbar{display:none}.thumbs__tab{flex:0 0 auto;flex-direction:column;gap:3px;min-width:56px;min-height:0;height:var(--strip-h);padding:0 8px;scroll-snap-align:start;border-bottom:0;border-right:1px solid var(--tab-sep);background-image:linear-gradient(to top,var(--tab-bleed) var(--tab-strip-w),transparent var(--tab-strip-w))}.thumbs__tab.is-stamped:after{right:4px;bottom:calc(var(--tab-strip-w) + 4px)}.thumbs__no{display:none}.thumbs__short{display:block}.thumbs__glyph{font-size:18px}.thumbs__label{display:none}.thumbs__tab--console{display:flex;position:sticky;left:0;z-index:1;min-width:calc(64px + var(--safe-l));padding-left:calc(8px + var(--safe-l));background:var(--tab-search-bg);color:var(--tab-search-ink);border-right:1px solid var(--tab-lo)}.thumbs__tab--console .thumbs__short{color:inherit}.thumbs__tab--console:hover{background:var(--verm);color:var(--on-verm)}.thumbs__tab[aria-current=page]:before,.thumbs__tab[aria-current=true]:before,.thumbs__tab.is-active:before{inset:-6px 0 auto;width:auto;height:6px}}@media(max-height:500px)and (orientation:landscape){.thumbs__tab{flex-direction:row;gap:6px;padding:0 12px;min-width:0}.thumbs__glyph{font-size:17px}.thumbs__tab--console{min-width:0;padding-left:calc(12px + var(--safe-l));padding-right:14px}.thumbs__tab[aria-current=page]:before,.thumbs__tab[aria-current=true]:before,.thumbs__tab.is-active:before{top:-4px;height:4px}}:root:lang(en) .thumbs__short{order:0;font-weight:600;font-size:14px;line-height:1.1}:root:lang(en) .thumbs__glyph{order:1;font-size:13px}@media(min-width:901px)and (min-height:501px),(min-width:901px)and (orientation:portrait){:root:lang(en){--rail-w: 80px}:root:lang(en) .thumbs__tab{flex-direction:column;gap:3px;padding-top:6px;padding-bottom:6px}:root:lang(en) .thumbs__short{display:block}}@media(min-width:901px)and (min-height:501px)and (max-height:800px),(min-width:901px)and (orientation:portrait)and (max-height:800px){:root:lang(en) .thumbs__tab{padding-top:4px;padding-bottom:4px;gap:2px}}@media(min-width:901px)and (min-height:501px)and (max-height:620px),(min-width:901px)and (orientation:portrait)and (max-height:620px){:root:lang(en) .thumbs__glyph{display:none}}@media(max-height:500px)and (orientation:landscape){:root:lang(en) .thumbs__tab{gap:5px}:root:lang(en) .thumbs__glyph{position:relative;top:-1px}}@media(min-width:901px)and (min-height:501px),(min-width:901px)and (orientation:portrait){:root:lang(en) .thumbs__short{font-size:13px;letter-spacing:-.005em}}@property --thumbs-fade-l{syntax: "<length>"; inherits: false; initial-value: 0px;}@property --thumbs-fade-r{syntax: "<length>"; inherits: false; initial-value: 28px;}@media(max-width:900px),(max-height:500px)and (orientation:landscape){.thumbs{--thumbs-pin: calc(var(--pin-search, calc(64px + var(--safe-l, 0px))) + var(--pin-w, 0px));-webkit-mask-image:linear-gradient(90deg,#000 var(--thumbs-pin),transparent var(--thumbs-pin),#000 calc(var(--thumbs-pin) + var(--thumbs-fade-l)),#000 calc(100% - var(--thumbs-fade-r)),transparent);mask-image:linear-gradient(90deg,#000 var(--thumbs-pin),transparent var(--thumbs-pin),#000 calc(var(--thumbs-pin) + var(--thumbs-fade-l)),#000 calc(100% - var(--thumbs-fade-r)),transparent);-webkit-mask-repeat:no-repeat;mask-repeat:no-repeat;-webkit-mask-size:100% calc(100% + 8px);mask-size:100% calc(100% + 8px);-webkit-mask-position:0 -8px;mask-position:0 -8px;-webkit-mask-clip:no-clip;mask-clip:no-clip}@supports (animation-timeline: scroll()){.thumbs{animation:thumbs-edges linear both;animation-timeline:scroll(self inline)}}html:has(.thumbs):after{content:"";position:fixed;left:0;right:0;bottom:0;z-index:calc(var(--z-rail) - 1);height:calc(var(--strip-h) + var(--safe-b));background:var(--tab-lo);pointer-events:none}}@keyframes thumbs-edges{0%{--thumbs-fade-l: 0px;--thumbs-fade-r: 28px}6%{--thumbs-fade-l: 28px}94%{--thumbs-fade-r: 28px}to{--thumbs-fade-l: 28px;--thumbs-fade-r: 0px}}@media print{html:has(.thumbs):after{display:none!important;content:none!important}}@media(min-width:901px)and (min-height:501px),(min-width:901px)and (orientation:portrait){:root .thumbs .thumbs__tab{padding-left:var(--tab-pad);padding-right:calc(var(--tab-bleed-w) + 1px)}:root:lang(en) .thumbs .thumbs__short{font-weight:clamp(400,calc(400 + (var(--k) - 1) * 18.2),600);letter-spacing:-.01em}}@property --rail-quiet{syntax: "<number>"; inherits: true; initial-value: 0;}@keyframes thumbs-recede{0%{--rail-quiet: 1}to{--rail-quiet: 0}}@media(min-width:901px)and (min-height:501px),(min-width:901px)and (orientation:portrait){@supports (animation-timeline: scroll()){html:has(.main--home) .thumbs{animation:thumbs-recede linear both;animation-timeline:scroll(root block);animation-range:0 80vh}}.thumbs:is(:hover,:focus-within){--rail-wake: 0}}.chapter{position:relative;min-width:0}.chapter>*+*{margin-top:var(--section-gap)}.chapter>.opener+*{margin-top:calc(var(--section-gap) * .6)}.opener{position:relative;display:grid;grid-template-columns:repeat(12,minmax(0,1fr));column-gap:var(--gutter);align-items:center;min-height:min(78vh,720px);padding-block:var(--s-7) var(--s-6);border-bottom:1px solid var(--rule-strong)}.opener:after{content:"";position:absolute;left:-10%;top:8%;width:55%;height:90%;z-index:-1;pointer-events:none;background:radial-gradient(closest-side,var(--verm-wash),transparent 70%);opacity:.7}.opener__glyph{grid-column:1 / span 5;grid-row:1 / span 10;align-self:stretch;position:relative;display:flex;align-items:center;margin-left:calc(-1 * var(--pad-l) - .14em);font-family:var(--f-cjk-display);font-weight:900;font-size:var(--fs-giant);line-height:.86;color:var(--ink);user-select:none;pointer-events:none;white-space:nowrap;overflow:visible}.opener__glyph>.giant{font-size:inherit;line-height:inherit}.opener .kicker{grid-column:7 / -1}@media(max-width:1100px){.opener__glyph{grid-column:1 / span 4}.opener .kicker{grid-column:5 / -1}}@media(max-width:760px){.opener{display:block;min-height:0;padding-top:0;overflow:hidden;margin-inline:0}.opener:after{width:100%;height:50%;top:0}.opener__glyph{display:block;height:auto;margin:0 0 var(--s-5) calc(-1 * var(--pad-l));padding-top:var(--s-3);font-size:200px;line-height:1.065;overflow:hidden;border-bottom:1px solid var(--rule-strong)}.opener__glyph>.giant,.opener__glyph{text-indent:0}}.chapter__section-title{display:flex;align-items:baseline;gap:14px;margin-bottom:var(--s-5);padding-bottom:var(--s-3);border-bottom:1px solid var(--rule-strong);font-size:var(--fs-h2)}.chapter__section-title b{font:500 var(--fs-mono)/1 var(--f-mono);letter-spacing:.02em;color:var(--verm-ink)}.articles{margin-top:var(--s-6)}.wechat{display:flex;flex-wrap:wrap;align-items:center;gap:var(--s-4) var(--s-5);margin:var(--s-5) 0;padding:var(--s-4) var(--s-4) var(--s-4) 18px;max-width:calc(var(--measure) + 8ch);border:1px solid var(--rule-strong);border-left:3px solid var(--verm);background:var(--surface)}.chapter-next{position:relative;padding-top:0}.chapter-next__link{position:relative;display:grid;grid-template-columns:auto minmax(0,1fr);align-items:end;gap:var(--s-3) var(--s-6);padding:var(--s-6) 0 var(--s-5);border-top:2px solid var(--rule-strong);color:var(--ink);text-decoration:none;overflow:hidden}.chapter-next__link:hover{color:var(--ink)}.chapter-next__glyph{font-family:var(--f-cjk-display);font-weight:900;font-size:clamp(96px,12vw,180px);line-height:.82;color:var(--ink);transition:color var(--t-ui) var(--ease-ui),transform var(--t-reveal) var(--ease-ink)}.chapter-next__hint{margin-top:var(--s-3);font:italic 400 14px/1.45 var(--f-text);letter-spacing:0;text-transform:none;color:var(--ink-2)}.chapter-next__hint:lang(zh){font-style:normal}.chapter-next__hint kbd{display:inline-grid;place-items:center;min-width:22px;height:22px;padding:0 5px;border:1px solid currentColor;border-radius:3px;font-size:var(--fs-mono);font-style:normal}@media(pointer:coarse){.chapter-next__hint{display:none}}.chapter-exp{display:flex;align-items:baseline;gap:8px;margin-top:var(--s-4);font:italic 400 15px/1.45 var(--f-text);color:var(--ink-2)}.chapter-exp:lang(zh){font-style:normal}.chapter-exp:before{content:"";flex:none;width:11px;height:11px;align-self:center;background:var(--ink-3);clip-path:polygon(50% 0,61% 39%,100% 50%,61% 61%,50% 100%,39% 61%,0 50%,39% 39%)}.chapter-exp.is-done,.chapter-exp[data-done],.chapter-exp[data-state=done]{color:var(--ink)}.chapter-exp.is-done:before,.chapter-exp[data-done]:before,.chapter-exp[data-state=done]:before{background:var(--gold);filter:drop-shadow(0 0 4px rgba(242,180,90,.8))}.chapter-exp a{color:var(--verm-ink)}.chapter-next__link:hover .chapter-next__glyph{color:var(--verm);transform:translate(6px)}#honesty{scroll-margin-top:calc(var(--hdr) + 24px)}@media(prefers-reduced-motion:no-preference){}@media(max-width:760px){@supports (animation-timeline: scroll()){}}.chapter-exp{max-width:30em}.chapter-exp:lang(zh){max-width:36em}@media(scripting:enabled){.theme-menu[data-js][hidden]{display:inline-flex!important}}@media(scripting:enabled)and (min-width:761px){.site-header__console[data-js][hidden]{display:inline-flex!important}}@media(scripting:enabled)and (min-width:901px)and (pointer:fine){.site-header__console kbd[data-kbd]:empty{display:inline-grid!important}.site-header__console kbd[data-kbd]:empty:before{content:"Ctrl K"}:root[data-platform=apple] .site-header__console kbd[data-kbd]:empty:before{content:"⌘K"}}@media(scripting:enabled)and (min-width:481px){.site-header__passport[data-js][hidden]{display:inline-flex!important;visibility:hidden}}@media(scripting:enabled)and (max-width:900px){.thumbs__tab--console[data-js][hidden]{display:flex!important}}.theme-menu{position:relative;display:inline-flex;flex:none}.theme-menu[hidden]{display:none}@media(max-width:359px){.theme-menu,.theme-menu[data-js][hidden]{display:none!important}}.theme-menu__btn{gap:7px;padding:0 10px;anchor-name:--theme-menu-btn}.theme-menu__btn .ico{width:18px;height:18px;flex:none}.theme-menu__btn .ico--theme-light,.theme-menu__btn .ico--theme-dark{display:none}:root[data-theme=light] .theme-menu__btn .ico--theme-auto,:root[data-theme=dark] .theme-menu__btn .ico--theme-auto{display:none}:root[data-theme=light] .theme-menu__btn .ico--theme-light,:root[data-theme=dark] .theme-menu__btn .ico--theme-dark{display:block}.theme-menu__btn:lang(zh){font-family:var(--f-cjk-ui);font-size:14px;font-weight:600;letter-spacing:.02em}.theme-menu:has(:popover-open) .theme-menu__btn{background:var(--ink);color:var(--paper)}.theme-menu__word{display:none}@media(min-width:1500px){.theme-menu__word{display:inline}}.theme-menu__panel{position:fixed;inset:auto;top:calc(var(--hdr-h, 56px) + var(--safe-t, 0px) + 6px);right:calc(var(--rail, 0px) + max(var(--margin, 16px),var(--safe-r, 0px)));margin:0;min-width:11.5em;padding:4px;border:1px solid var(--rule-strong);background:var(--paper);color:var(--ink);box-shadow:var(--shadow-pop);overflow:visible}.theme-menu__panel:popover-open{display:grid}@supports (position-anchor: --a) and (top: anchor(bottom)){.theme-menu__panel{position-anchor:--theme-menu-btn;top:calc(anchor(bottom) + 6px);right:anchor(right);position-try-fallbacks:flip-inline}}.theme-menu__panel>button{display:flex;align-items:center;gap:10px;min-height:40px;padding:0 14px 0 10px;font:500 var(--fs-mono)/1 var(--f-mono);letter-spacing:.02em;text-align:start;white-space:nowrap;color:var(--ink);transition:background-color var(--t-ui) var(--ease-ui),color var(--t-ui) var(--ease-ui)}.theme-menu__panel>button:lang(zh){font-family:var(--f-cjk-ui);font-size:15px;font-weight:600}.theme-menu__panel>button+button{border-top:1px solid var(--rule)}.theme-menu__panel>button .ico{width:18px;height:18px;flex:none}.theme-menu__panel>button:hover{background:var(--verm-wash);color:var(--verm-ink)}.theme-menu__panel>[aria-pressed=true],.theme-menu__panel>[aria-pressed=true]:hover{background:var(--ink);color:var(--paper)}.theme-menu__panel>[aria-pressed=true]:after{content:"✓";margin-left:auto;padding-left:14px;font-family:var(--f-mono)}.theme-menu__panel>button:focus-visible{outline-offset:-3px}.theme-menu__panel>[aria-pressed=true]:focus-visible{outline-color:var(--paper)}@media(prefers-reduced-motion:no-preference){.theme-menu__panel:popover-open{animation:themeMenuIn .16s var(--ease-ui) both}@keyframes themeMenuIn{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}}@supports not selector(:popover-open){.theme-menu.theme-menu[data-theme-menu]{display:none!important}}@media(max-width:760px){.theme-menu__btn{padding:0;width:var(--btn-h)}}@media(max-width:480px){.site-header__passport{display:none!important}}@media(max-width:400px){.site-header__index:lang(en) .hz{display:none}}@media(pointer:coarse){.theme-menu__panel>button{min-height:44px}.theme-menu__panel{min-width:12.5em}}.theme-switch button{min-width:44px}.theme-switch button:lang(zh){font-family:var(--f-cjk-ui);font-size:14px;font-weight:600}.theme-switch button:hover{color:var(--ink)}.theme-switch [aria-pressed=true]:hover{color:var(--paper)}@media(scripting:none){.fig-try[data-nojs]:after{content:attr(data-nojs);font:italic 400 15px/1.35 var(--f-text);color:var(--ink-2)}.fig-try[data-nojs]:lang(zh):after{font-style:normal}}.boundary__fpt{display:block}.boundary__fpt[hidden]{display:none}@media(scripting:enabled){.boundary__fpt[data-js][hidden]{display:block!important;visibility:hidden}.boundary__fpt{min-height:70px}.boundary__fpt:lang(zh){min-height:36px}}@media(scripting:enabled)and (max-width:560px){.boundary__fpt:lang(zh){min-height:74px}}@media(scripting:enabled)and (min-width:901px){.boundary__fpt,.boundary__fpt:lang(zh){min-height:36px}}@media(pointer:coarse){.site-header__id,.lang-switch a{min-height:44px}.figure input[type=range]{min-height:44px;margin-block:-6px}}.glyph-gloss{margin:0;font:italic 400 var(--fs-min)/1.35 var(--f-text);letter-spacing:0;text-transform:none;color:var(--ink-2)}.glyph-gloss [lang|=zh]{font-family:var(--f-cjk-display);font-style:normal;font-weight:900;font-size:13px;letter-spacing:.04em}.boundary__art{grid-column:1 / span 4;grid-row:1 / span 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